Seleit Area constitutes the north eastern part of Khartoum state in Sudan. It is located between 32° 31`- 33° 00` E and 15° 45`- 16° 00` N; and has an area of 1,150 km². The area is a flat plain with some scattered cropouts. It is of a semi arid climate, where the spatial variation in amount and duration of rainfall during the rainy season is dominant (average annual rainfall 120 mm), with sparse vegetation. About 80% of the area is dominated by the rangeland with little cultivation near the Nile and in the courses of the wadis (ephemeral seasonal streams). The main wadis of this region are El Kangar, El Seleit, El Jaili, and El Kabbashi. The area experienced destructive flash floods due to rainstorms with high intensity and short duration in addition to the sparse vegetation. During the years1988, 1994, 1998 and 2001, the area was subjected to severe flash floods that left huge losses for the settlement there. The assessment of the potential floodwater harvesting in the area was carried out using the NAM Rainfall-Runoff model to estimate the potential runoff. The watersheds of the four wadis were defined and calculated using ArcHydro. Due to the application of GIS and remote sensing the potential of water harvesting in the study area could be analysed and can be integrated into the regional planning process Implementing such systems could open new environments for permanent and better settlement conditions as well as new opportunities for sustainable development.